Map Correlation between the Underdark and Faerun?

[RavenJovan]

I'm trying the go through old material maps to find the relationship between the geography of the Underdark with the Surface of Faerun, more specifically the Western Heartlands Region.

Does anyone know what underdark locations are under or near the locations in the western heartlands (including the greenfields,near Greenest)? Or are their any working links to sites that can give me this information?

Any help would be greatly appreciated. Thanks.

[qube]

The greenfield's, South of Candlekeep? (map (https://vignette2.wikia.nocookie.net/forgottenrealms/images/1/10/Map_-_Faerun_-_3E.jpg/revision/latest?cb=20120201174035))
Seems like that's where the Netherese Caverns are (map (http://forgottenrealms.wikia.com/wiki/Category:Maps_of_the_Netherese_Caverns?file=IMG_20 151012_121128_edit.png))

underdark map (http://www.realmshelps.net/faerun/underdark/pix/undermap.jpg)

[RavenJovan]

Ok so if its the Netherese Caverns, is there a link that can tell me the details of this location?